Lens Review: Pentax 40mm f/2.8 XS SMC DA

Pentax released its new 40mm f/2.8 XS SMC DA "pancake" lens with the K-01 mirrorless camera, making for a very small and portable camera-lens combination. With its K-mount, the lens is compatible with other Pentax cameras, so we took the opportunity to put it through its paces in our test lab. Does smaller become better? Check out the results for yourself in our full review of the Pentax 40mm f/2.8 XS SMC DA "pancake" lens.